This was my first idea for my entry. I was going to just add a heatbreak before I settled on my final design. It would give someone the clearance needed to insert a door and the "clearance" of a flair without the "intimidation" .
Mine is drawn with a heatbreak, but for someone who isn't interested in that, could set the outside arch directly on the interior arch.
Not wanting that much reveal or that wide of an opening: Notch the brick like I did (back in my build) without the space for the heatbreak.

Dino, the template on post 305 is exactly what I was looking for, do you have any other templates that you think I might need?

I just found a 36" oven "dome study" I did for Gene a year ago. I'll post it here in pdf. Again: it was a study to see how small of a block stand or base you would need. It seems (to me) that it should be 4 blocks wide unless it's igloo style or perhaps a corner mount although 3.5 blocks seemed tight but do-able if your careful with the insulation and let overflow into the "stud" space.

I don't show the herringbone floor it but it does have the soldier course and a good idea of how the 2 arches are placed.

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